Wont do much good in a single chip application, it will help you dial in the DC offset at idle, but wont be linear with gain.
The circuit will help set idle offset in a bridge parallel application, the circuit posted below has been used by myself with great results for large BPA amps.

analog_se, No I did not notice any sonic improvements, its sounds almost identical to a singal non-inverted chip with no Ci cap except with much more power and control.
The idea was to better match each chip in the circuit without useing .1% or better resistors. My original circuit used 1% metal films and 2% carbon films for the NFB resistors and .15ohm 5% output resistors.
What I did notice was a drastic reduction in idle current per chip as much as 35% down from 80 - 90ma to 45 - 55ma, and the 1watt distortion was also drasticaly reduced, frequency response stayed the same from 15hz to 45khz,but with less role off after 22Khz, the amp gained great amounts of headroom.